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Business Segment Information (Reconciliation of Total Net Business Profits under Internal Management Reporting Systems to Income Before Income Tax Expense on Consolidated Statements of Income) (Detail) - JPY (¥)
¥ in Billions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Net business profits (losses) + Net gains (losses) related to ETFs and others [1],[2] ¥ 1,461.1 ¥ 1,144.2 ¥ 1,005.8
Adjustment to reconcile management reporting to Japanese GAAP:      
General and administrative expenses: non-allocated gains (losses), net 3.3 27.5 28.6
Expenses related to portfolio problems (including reversal of (provision for) general reserve for losses on loans) (142.1) (62.1) (114.0)
Gains on reversal of reserves for possible losses on loans, and others 9.1 10.5 7.6
Net gains (losses) related to stocks—Net gains (losses) related to ETFs and others 286.8 95.9 54.7
Net extraordinary gains (losses) 49.1 21.9 40.9
Others (45.0) (47.9) (68.8)
Income before income tax expense under Japanese GAAP 1,622.2 1,190.0 955.0
Adjustment to reconcile Japanese GAAP to U.S. GAAP:      
Derivative financial instruments and hedging activities (579.1) (243.2) 50.5
Investments 695.6 (147.4) 571.7
Loans (8.4) (9.1) (8.8)
Allowances for credit losses (83.7) (73.5) 25.3
Premises and equipment (38.3) (29.9) (55.1)
Land revaluation 7.4 39.0 4.9
Business combinations 10.5 7.4 10.8
Pension liabilities (48.8) (20.7) (60.4)
Consolidation of variable interest entities 212.4 24.5 211.2
Foreign currency translation (94.3) 10.5 (83.2)
Others (9.9) 11.5 0.9
Income before income tax expense under U.S. GAAP ¥ 1,685.6 ¥ 759.3 ¥ 1,623.1
[1] Income and expenses of foreign branches of MHBK and foreign subsidiaries with functional currencies other than Japanese Yen have been translated for purposes of segment reporting using the budgeted foreign currency rates. Prior period comparative amounts for such foreign currency income and expenses have been translated using current period budgeted foreign currency rates.
[2] Net business profits (losses) is used in Japan as a measure of the profitability of core banking operations, and is defined as gross profits (as defined above) less general and administrative expenses (excluding non-allocated gains (losses), net) plus equity in earnings (losses) of equity method investees—net less amortization of goodwill and others. Measurement of net business profits (losses) is required for regulatory reporting to the Financial Services Agency of Japan.